Radial Arm Flusing Work

Radial Collector Wells

Radial collector wells are a variation of the beach well in which multiple horizontal collector wells are connector to a central caisson that acts a wet well or pumping station from which water is pumped to the desalination plant. The use of multiple horizontal wells means that the production of each radial well can be significantly greater than a single vertical well.

Scope

This process Engineering Guide covers Best Practices in Ammonia Plant-Pre-commissioning; Piping and vessels flushing and cleaning procedures and shall apply to all GBH Enterprises (GBHE) process engineers worldwide.

Aim/Purpose

This procedure applies generally to the cleaning and flushing underground and above ground pipelines, tanks and vessels which shall be performed for process reasons during pre-commissioning. Special instructions for the system will be fixed by a detail procedure

The purpose of flushing and cleaning lines and vessels is to remove loose foreign matter, Production residues and surface protection substances from the inside of line and vessels (Welding rods, Sand, earth, pebbles, nuts and bolts, tools, rags, oil and greasy films, etc.) in order to avoid line blockages, damage to sensitive components such as orifice plates, turbine, compressors, pumps impellers, value seats and so on.

Responsiblities

The responsibilities are given in the work instruction to the planet operator standard engineering procedures preparation of commissioning working step, network cleaning, flushing and purging

Cleaning with water

Line flushing uses water from the normal supply network of the plant, if available. Water supply could conceivably be from other sources, i.e. city water lines. Supply boat temporary pumps, etc. depending upon the ongoing situation.

This type of flushing normally involves taking a section of piping and flushing It from a “start-point” to an open end. A high velocity flow should be achieved in order to be effective in removing loose debris and rust from piping (or vessel) walls. In some circumstances additional pumping capacity will be required.

a)Continuous blowing of air

Air is continuously blown from a source (directly from air compressor or via a large capacity vessel) at a high velocity through the lines (and vessels) to carry away the loose material. Due to the high velocity of the air. A light erosion of the walls generally occurs during the air blowing. Which is beneficial with regards to cleaning.

b) Quick decompression

A network is filled with compressed air up to the setting pressure of a repture disk. When the rupture disk blows out. The source of air is stopped and the pressure inside the network decreases quickly.

This operation will preferably be done using a “quick opening value” after having pressurized the the network to the desired level of pressure. The existing valves of the network may not be used for this purpose. Except for special cases

The quick decompression causes a high velocity of air in the pipes. Thus removing loose material and performing a light erosion on the walls which eliminate rust and scale. During this operation the reaction forces affecting the piping shall be considered